Hi I'm new to this, I've been given a question on compound angles and I really don't know how to go about it. Any help would be greatly appreciated:
Using compound angles prove that Cos(y-pi)+Sin(y+pi/2)=0
thanks Shaun
Hello, Shaun!
You are expected to know these Compound Angle Identities:
. .
. .
Using compound angles prove that: .
We have: .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
We have: .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
Therefore: .